It sounds as though you studied in Russia quite a long time ago and it was a one year thing part of a degree?
When you say you studied their society and politics for decades was this in the UK working for one of the foundations?
Could you explain what the end game is? Do you think that Russia wants to conquer western Europe and then the US? Do you know why? Because we don't have a whole lot going for us at the moment, I am not sure why anyone would want to conquer us.
Some people say "like Hitler" but Hitler had the Lebensraum policy to do with getting extra farmland to feed Germans - Russia clearly doesn't have the same pressure and so I doubt this is why they would march west.
Caesar conquered for the hell of it... but it was mostly pretty straightforward and so quite different from today. Anyone trying to conquer the west today would not just be looking at NATO they'd also be looking at guerillas, terrorists, extreme nationalists. So I don't think that is it either.
And what do we have? We aren't rich in natural resources, we are a failed state... why on earth would they want to conquer us?
And as for destablising, again the question would be why? They want trading partners so destablising would not be useful.